This Halloween, we’re turning the streets of Amsterdam into one giant, interactive ghost hunt — and we need your help to make it happen.
We’re GRAS, a small creative team that believes in making marketing fun, bold, and unforgettable. On October 31st, we’ll unleash hundreds of glowing “ghost lights” across the city, hidden in unexpected spots. With a special light, players will discover hidden clues and secret posters — each leading them to local shops, bars, and cafés taking part in the game.
The stunt will bring people together, shine a spotlight on small businesses, and turn an ordinary Friday night into a city-wide adventure.
Your donation will go directly toward:
- Printing our special posters (including hidden, light-activated layers)
- Building ghost costumes for our volunteers
- Buying hundreds of ghost lights for players to use
- Covering safety, snacks, and coordination for our volunteer team
Let’s make Amsterdam a spooky this Halloween.
Organizer
GRAS Guerilla marketing
Organizer